* {
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

body {
  margin: 0;
  height: 100vh;
  background: linear-gradient(135deg, #667eea, #764ba2);
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

/* Background Glow */
body::before {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  background: rgba(255,255,255,0.1);
  filter: blur(120px);
  border-radius: 50%;
  top: -120px;
  left: -120px;
}

/* Center Card */
.container {
  text-align: center;
  animation: fadeIn 1.2s ease;
}

.card {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(15px);
  border-radius: 20px;
  padding: 40px;
  max-width: 420px;
  color: white;
  box-shadow: 0 20px 50px rgba(0,0,0,0.25);
  transform: translateY(0);
  animation: float 4s ease-in-out infinite;
}

h1 {
  font-size: 28px;
  margin-bottom: 10px;
}

p {
  font-size: 15px;
  opacity: 0.9;
  margin-bottom: 25px;
}

/* Button */
button {
  background: white;
  color: #4f46e5;
  border: none;
  padding: 12px 22px;
  border-radius: 12px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.25s;
}

button:hover {
  transform: scale(1.05);
  background: #f3f4f6;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(25px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes float {
  0%,100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}